Best way to grab a few pixels from the Camera Feed

Unity 2020.3.f1
Xcode 13.2 beta

I’m trying to grab a small rectangle of pixels from the camera feed -
is the technique described in this thread the best way to do it? - Easiest way to display the Camera Video to a texture

presumably if I do it this way I’ll then have to actually render the Feed render texture behind the virtual objects explicitly - which is not really a problem. Is this going to hit performance in any way - or can you think of a better way to get at those pixels.

Hello Ross,
In answer to your question, yes the technique described in the thread you mentioned is the best way to capture textures at the current time. We do not anticipate any performance impact currently. Please let us know how this works for you.